fix(frontend): fix Transcripts and Quotas missing in embedded Cloud UI sidebar (#2312)

Fix store update ordering race condition in refreshSupportedEndpoints().
The useApiStore subscription fires synchronously and calls updateSidebarItems(),
which reads feature support from useSupportedFeaturesStore. By updating
useSupportedFeaturesStore first, the subscription sees correct feature data.

Author: weeco

frontend/src/state/backend-api.ts

@@ -1022,8 +1022,12 @@ const _apiCreator = (set: any, get: any) => ({
       if (!r) {
         return null;
       }
-      set({ endpointCompatibility: r.endpointCompatibility });
+      // IMPORTANT: Update useSupportedFeaturesStore BEFORE useApiStore.
+      // The useApiStore subscription in config.ts fires synchronously and calls
+      // updateSidebarItems(), which reads feature support from useSupportedFeaturesStore.
+      // If useApiStore is updated first, the subscription sees stale feature data.
       useSupportedFeaturesStore.getState().setEndpointCompatibility(r.endpointCompatibility);
+      set({ endpointCompatibility: r.endpointCompatibility });
       return r;
     } catch (err) {
       // biome-ignore lint/suspicious/noConsole: intentional console usage